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CAS
FAX
DTMF
Vigor3300V+ Series User's Guide
Single Codec - If you checked this box, only preferred codec
will be used for outgoing and incoming calls. And if the
remote end does not support such Codec, the VoIP
communication will be failed.
Codec Rate - Type the rate value to be applied on this port.
Codec VAD- Enable or Disable VAD (Voice Activity
Detection). It can detect whether the voice activity is
progressing or not. If not, RTP packets transmission will be
stopped for saving more bandwidth.
Microphone Gain- The gain value while transmitting voice.
The default value is 0. The range is from -32 to 31.
Speaker Gain - The gain value while receiving voice. The
default value is 0. The range is from -32 to 31.
FAX Mode -The FAX function mode. There are several
options:
Transparent: FAX will be transmitted via voice channel; no
fax relay and no Codec change will be involved. This is the
default value.
T.38 Relay: Using T.38 Fax Relay.
Bypass: Once FAX is detected, the Codec will automatically
switch to a high bit rate type (G.711a/u or G.726) to make
sure FAX can transmit successfully.
If this option is selected, the Vigor3300 will apply these two
following settings (FAX Bypass Codec and FAX Bypass
Codec Rate).
FAX Bypass Codec - Select one option to be applied if FAX
mode is configured as Bypass mode.
FAX Bypass Codec Rate - Select one option (20 or 40) to be
applied if FAX mode is configured as Bypass mode. The
stability for the faxing result of documents with codec rate
20ms is higher than 40ms. Yet, the bandwidth request for
40ms is less than 20ms.
DTMF Mode -
InBand: Choose this one then the Vigor will send the DTMF
tone as audio directly when you press the keypad on the phone.
OutBand (RFC2833): Choose this one then the Vigor will
capture the keypad number you pressed and transform it to
digital form then send to the other side; the receiver will
generate the tone according to the digital form it receive. This
function is very useful when the network traffic congestion
occurs and it still can remain the accuracy of DTMF tone.
SIP INFO: Choose this one then the Vigor will capture the
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